W. Nicoll 
20 
spines quite to posterior end. Oral sucker 0-09-0"13 mm.; ventral 
sucker 0-09-0-16 mm., situated a quarter of the body length from the 
anterior end. Pharynx 0-05-0-10 mm. in diameter. Intestine as in 
A. barbarus. Ovary and testes in the posterior half of the body almost 
directly tandem. Post-testicular space only one-sixth of the body 
length. Yolk glands extending from the posterior end of the body to 
midway between the ovary and ventral sucker. Uterus between ovary 
and ventral sucker. Ova 0-06-0-07 x 0-04 mm. 
Aephnidiogenes ptochus n. sp. 
Length 1-3-2-8 mm.; breadth 0-33-0-68 mm. Suckers each 0-08- 
0-24 mm. Yolk glands confined to the region of the ovary and only 
extending along the sides about one-fifth of the length of the body. 
Ova 0-045-0-048 x 0-022-0-024 mm. Otherwise similar to A. levenseni. 
The diagnosis of the genus Aephnidiogenes may be briefly summarised 
thus: 
Flat, elongated distomes of moderate size with spiny cuticle. Suckers 
small and not far distant from each other. Prepharynx absent, oeso¬ 
phagus short, diverticula long. Testes tandem or slightly obUque, in 
posterior half of the body; ovary in front of the testes. Yolk glands 
lateral, either restricted to region of ovary or extending along con¬ 
siderable part of body. Uterus short, not extending back beyond 
anterior testis. Ova measure 0-045-0-07 x 0-022-0-04 mm. Terminal 
male genitalia consist of muscular genital sinus into which the terminal 
part of the uterus opens, a small pars prostatica and large convoluted 
vesicula seminalis, neither of which is enclosed in a cirrus-pouch. 
Habitat: intestine of Marine Fishes, Queensland and Bermuda. 
Type: A. barbarus from Pomadasis hasta. 
Genus Genolopa Linton 
Genolopa trifolifer n. sp. 
(Plate IV, fig. 4.) 
Several specimens of this interesting parasite were obtained from 
the intestine and coeca of a grunter {Pomadasis hasta). A single 
specimen also occurred in the swim-bladder. It is a small species 
measuring 1-5-2-1 mm. in length. The general outline is oval with 
pointed ends. The greatest breadth, which occurs a little behind the 
middle of the body, is 0-3-0-7 mm. Not infrequently the body is of 
fairly uniform breadth throughout with the anterior end somewhat 
